hfsplus: fix filesystem size checks

generic_check_addressable can't deal with hfsplus's larger than page
size allocation blocks, so simply opencode the checks that we actually
need in hfsplus_fill_super.

Signed-off-by: Christoph Hellwig <hch@tuxera.com>
Reported-by: Pavel Ivanov <paivanof@gmail.com>
Tested-by: Pavel Ivanov <paivanof@gmail.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 8 insertions, 3 deletions

diff --git a/fs/hfsplus/super.c b/fs/hfsplus/super.c
index cadbb8c81887..d24a9b666a23 100644
--- a/fs/hfsplus/super.c
+++ b/fs/hfsplus/super.c
@@ -344,6 +344,7 @@ static int hfsplus_fill_super(struct super_block *sb, void *data, int silent)
         struct inode *root, *inode;
         struct qstr str;
         struct nls_table *nls = NULL;
+        u64 last_fs_block, last_fs_page;
         int err;
 
         err = -EINVAL;
@@ -399,9 +400,13 @@ static int hfsplus_fill_super(struct super_block *sb, void *data, int silent)
         if (!sbi->rsrc_clump_blocks)
                 sbi->rsrc_clump_blocks = 1;
 
-        err = generic_check_addressable(sbi->alloc_blksz_shift,
-                                        sbi->total_blocks);
-        if (err) {
+        err = -EFBIG;
+        last_fs_block = sbi->total_blocks - 1;
+        last_fs_page = (last_fs_block << sbi->alloc_blksz_shift) >>
+                        PAGE_CACHE_SHIFT;
+
+        if ((last_fs_block > (sector_t)(~0ULL) >> (sbi->alloc_blksz_shift - 9)) ||
+            (last_fs_page > (pgoff_t)(~0ULL))) {
                 printk(KERN_ERR "hfs: filesystem size too large.\n");
                 goto out_free_vhdr;
         }